It could be 6411 Sales and account representatives – wholesale trade (non-technical) . They are employed by establishments that produce or provide goods and services such as petroleum companies, food, beverage and tobacco producers, clothing manufacturers, motor vehicles and parts manufacturers, hotels, business services firms, and transportation companies.
Just follow the description, if possible, ask your employer to write a reference letter based on the description, let your employer/HR know it's only for immigration purposes, so they'd write for you as close as the NOC description. The more straightforward your job described by the employer, the easier for them to evaluate and for you to get the nomination. just my thought

good luck.